Automatic magic lantern.



No. 891,175.' Mmmm JUNE 16, me. H. INGRAM- AUTMATIG MAG LANTERN.

APPLICATION FILED AUG.13. 1907.

Z SHEETS--SHEET N0. 891,175. PATENTE@ JUNE 16; lQ H. NGRM.

TMTIG MAGIC LNTERN. APPLICATION FLED AUG` 13,1907.

2 SHEETS-SHEET 2. w/ E @@@QQQ 'HAROLD INGRAM, oF LONDON, ENGLAND.

AUTOMATIC MAGIC' LANTERN.

No. 8,914,175.y

specification of Letters Patent.

Patented June 16, 1908.

.Application filed August 13, 1907. Serial No. 388,406.

,all whom it may concern: Be it known that I, HAROLD INGnAM, engineer,yresiding' at 30 Grays Inn road, London, W. C., En land, have inventedcertain new and useful mprovements in Automatic 'Magic Lanterns; and Ido hereby declare the followingfto bey afull, clear, and exactdescription of theinvention, such as will enable others skilledin theart to which it appertains tovmakefand use the same. f

This invention relates to optical lanterns,

' suitable for use `in displaying automatically a'series ofadvertisements, or pictures, the

` object being to produce a reliable machine which anyrunskilledattendant can operate. T ocarryv this into eHect I employ a revolvingdisk which fcai'ries a series of lantern slides and which is caused tointermittently rotate,

and automatically bring each slide Seriatim into the lens path ol thelantern, expose it for a short period and then display tlie next slide.`VI Vpreferably attain this result by means of a fixed speed electricmotor geared down to asuitable ratio, which operates all the movementsnecessary for rotating the circular carrier, arresting it, releasing theshutter, making the exposure, replacing the shutter and again revolvingthe carrier for the next plate.

I will now proceed to describe my invention by means of the accompanyingdrawings vin which:-

Figure 1. is' a sectional part elevation. Fig. 2. is a side view.

In the drawings A is the front plate and B the back plate. Between thetops of these two plates is pivoted the revolving lantern slide carrierC. The carrier is mounted on a spindle I, and is of a diametercorresponding to the number of plates or slides to be displayed, it isfitted with a series of plate carriers 2, and between each carrier arepins 3. The plates A and B are screwed together by means of screw pins4, upon which are distance pieces 5. Preferably pivoted on one of thepins 4, at the base of t-he machine is a pawl ratchet arm or lever 6,having a right angled limb 7, carrying a roller 8, at its extremity7 anda ratchet pawl 9, at the top end ofsaid arm. The pawl 9, is pivoted at10, and spring 11, reacts against its under face, the travel of suchpawl 9, being limited by a pin 12. The pawl 9, is formed to engage withthe carrier pins 3.

AThe motor 13, which for the sake ot" simplicity I prefer to beelectrical, (but which spur gears being pivoted on spindles 16, havingbearings in the front and back plates A. and B. rI`he cam disk 14.carries on one face a snail cam 17, which actuates the carrier rotatingmechanism, and on its other face it carries a short cani 18, whichoperates the shutter mechanism. This latter consists of a shut-ter 19,mounted on a lever 20, securely mounted on a spindle 21 the sainespindle carries a fast depending cam Vwiper 22, engaging ith the shuttercam 18, once every revolution of the cam wheel 14. The plates A and Bare screwed to a base board 25, and also mounted upon this or on abracket 24. is the lantern 26, which has the usual means ol producing astrong light, for this particular type of work I prefer to have anelectric arc lamp, ot the scissors, or other self centering type. `Thislantern 26r is preferably attached to the back plate B, of the machineand each plate in the carrier is arranged to stop immediately in acentral position in the path of its light.

Lantern tubes 27 and 2S provided with picture-projecting lenses ofapproved construction are carried bv the plate A so that the pictures onthe slides may be projected onto a suitable sheet or screen. A spring 29is arranged between the arm 6 and a stationary pin 29aL to hold thepawl9 in engagement with the pins 3 and to revolve the late C step by step.A guide 30 is arrange( on the cam-plate opposite the straight face ofthe cam, so as to form a passage for the i'oller 8.

The operation of my invention is as follows:-The lantern is lighted andthe lens cup removed. The motor is then setin inotion by a suitableswitch, and as only a small current is required I may use an adapter inconjunction with anSc. p. lamp holder. T his causes the cam wheel 14, torevolve releasing the shutter, and exhibiting the picture. As the caniwheel revolves, the arm 6, through Athe engagement of its roller S, withthe cam face, is caused to recede backwards against the ull of thecontractile s ring 29, until the ratc iet pawl has. passed um er thenext pin 3, on carrier face. By this time the 'shutter cam 18, has comeinto engagement with the shutter wiper 22, causing the shutter tosuddenly move upwards ancI obscure the picture (as shownin Fig-'1). The-ratchet pawl arm roller 8, has by now reached the apeX of the cam 17,and the pawl passing beyond the carrier pinnow presses against its side.lOn

the cam vwheel revolving the wiper suddenly* the slide carrier disk,against one yofwhoseA pins 8 the'pawl 9 is'pressing. The carrier iszrqtated until the cam wiper 8,V occupies .the-

pdsfition shown in Fig. 1., when a fresh plate f,1s in position forexposure. At this point the 1 lsl'iiitter cam wiper runs oil" its camthe shut- .terjfalling of its own Weight against apin 32.

y'Als-an arrestin device against shock when f driving the 5 carrierforward, I provide a .check paw] y33,' ivoted at 34, to a headed pinonplate B an ressed upon a spring 33a. A Ihis clicks'over t e pins asthey passipholding 'same firmly against the spring stop 35. This latterisa straight faced arm pivoted at 36, Vpressed forward by va bent sprin37, fixed at one end to a pin 38, its other en 39 being inserted in asmall hole or slot in the' arm. To prevent the spring jumping out of theslotit isbent'in the mannenshown in Fig. 1. 'From' the foregoing litwill be observed that I achieve my object with a very simple to themiddle part of the said frame, a disk for* the lantern-slides journaledlabove, the

and inexpensive mechanism, and which is axis of the said lantern 'andlens-tubes and revolving between them and provided with av series ofdriving-pins, an arm having its 'Y lower end pivoted 'to the 'said framebelow `the said disk 'and having apawl at its upper endufor engagingwith thesaid pins, an operating spring connected to the upper endportion of the said arm, a cam operating on the lower end ortion of thesaid. arm near its P pivot, and driving mechanism for revolving the saidcam.

2. The lcombination, with ,a supportin frame, of a lantern andlens-tubes secure to the middle part of the said frame, a disk for thelantern-slides journaled above lthe aXis of the said lantern andlens-tubes and 'revolving between them and provided with a oscillateslthe shutter periodically, and driving mechanism for revolving thetwosaid cams. i

In testimony witnesses. l

HAROLD INGRAM. Witnesses: v

F. HERO'N ROGERS.

whereotv I affix my signature, 'in presence'of two

